7-2. Standard thread tension; 7-2-1. Upper and lower thread tension; 7-2. Standard thread tension - Page 96

7. ADJUSTMENT 

BAS-311G, BAS-326G 

89

7-2. Standard thread tension 

Specifications 

Heavy-weight materials (-01) 

Medium-weight materials (-02) 

Upper thread 

#20 or similar 

#50 or similar 

Lower thread 

#20 or similar 

#50 or similar 

Upper thread tension (N) 

1.4 

−

 1.8 

0.8 

−

 1.2 

Lower thread tension (N) 

0.2 

−

 0.3 

Thread take-up spring height 

(mm) 

7 

−

 10 

Thread take-up spring 

tension (N) 

0.6 

−

 1.2 

0.2 

−

 0.5 

Pre-tension (N) 

0.1 

−

 0.6 

0.1 

−

 0.3 

Needle 

DP x 17 #19 

DP x 5 #16 

Normal sewing speed 

2,000 rpm 

2,000 rpm 

7-2-1. Upper and lower thread tension 

5155Q

4661Q